Pulmonary mucormycosis is an uncommon opportunistic fungal infection associated with diabetes mellitus, leukemia, lymphoma, and other debilitating diseases. It is diagnosed by the pathologic demonstration of typical hyphae, and the condition requires aggressive surgical treatment to reduce the risk of mortality. Pulmonary mucormycosis is associated with various clinical and radiological characteristics. Therefore, a rapid diagnosis and aggressive surgical approach based on early suspicion are important in high-risk patients in order to cure pulmonary mucormycosis. Here, we report the successful treatment of pulmonary mucormycosis in a 58-year-old male with glottic cancer and uncontrolled diabetes who had rapidly progressive necrotizing pneumonia and a bronchopleural fistula via an aggressive pathologic diagnosis and surgical resection.